Aida Nonoka is the protagonist of the story. She is about 15 years old, and lives in a dojo with her three older brothers [bothers!]. Her parents passed away when she was very young.
She has done judo since she was attacked by a drunk when she was 5, and saved by a brave young boy. Believeing that if she did judo, she would meet him again, she followed in her family's footsteps.
Nonoka is in love with both Shinobu and Yuya, and can never decide which one she truly loves. She loves Yuya's outgoing, fun personality but is drawn to Shinobu, who is quiet and considerate.
Nonoka's three brothers are Akira, Satoru, and Koji. They are extremely over-protective sometimes, and with good reason. Nonoka is awfully naive and clueless at times.
Nonoka is a freshman in class 5, and became Shinobu's class vice-president since their seats were together. She is very small, but is also very powerful. She is very cute and friendly.
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